System and method for manufacturing and after-market support using as-built data

ABSTRACT

An integrated manufacturing and a maintenance system include a metrology device and a CAD system which has access to parametric data from the metrology device, said “as-built” data being used by the CAD system to morph a CAD model reflecting the “as-built” data, which can be used in manufacturing and aftermarket support.

FIELD OF THE INVENTION

The present invention relates generally to large scale integrated manufacturing systems. More particularly, the present invention relates to manufacturing systems using metrology devices and three dimensional interactive computer software.

BACKGROUND OF THE INVENTION

In many large-scale manufacturing contexts, assembly precision is a fundamental requirement to maintain the engineering design intent, and for certification, by a customer or a government agency, that the manufactured product is fit for its intended use. Currently, large-scale manufactured items, and subassemblies for such items, are designed using computer-aided design (CAD) and/or computer-aided manufacturing (CAM) software. This software typically allows for product design modeling in three dimensions (3D). The 3D design is then converted to standard orthogonal two-dimensional drawings (2D), which is, from then on, considered the official “authority for manufacturing”. From the 2D engineering drawings, monolithic Floor Assembly Jigs and applied tooling fixtures, e.g. drill & locating jigs, are designed and built. The detail parts and subassemblies configuration is maintained and the tool becomes the control media to insure engineering configuration is achieved. Because the jigs and tools are often fixed, and the parts must be assembled while attached to the tool, adherence to the engineering design standards, within a specific tolerance, is maintained.

However, this manufacturing process poses several disadvantages. Significant resources are often spent creating the 3D models, which are often not used after the 2D conversions are created. The historical reason for converting 3D models to a 2D drawing format is the inability to link tolerance attributes to the three dimensional models. Currently, the three dimensional model are projected into convention 2D orthogonal views and dimensioned.

Additionally, both the 3D models and 2D drawings are theoretical, and do not reflect the influences of the manufacturing process, which may change the dimensions of the part or subassembly so that they differ from the theoretical, while being within the acceptable manufacturing tolerance. A number of aspects of the manufacturing process can lead to differences between the theoretical model and the as-built configuration, including product component tolerance build-up, free state versus restrained part condition, manufacturing process assembly variation, fastener-induced distortion, high interference and cold working, environmental factors such as temperature and vibration, inconsistencies in the manufacturing process, and fabrication variables such as cutter deflection. None of these environmental factors can be evaluated when the part or subassembly is designed using the CAD software. For this reason, the 3D and 2D drawings become inaccurate representations of the parts, subassemblies, or installations, as it is actually built. If compliance with governmental or customer standards is measured against theoretical drawings, manufacturers will be unnecessarily non-compliant too often. Also, this system requires ongoing quality control, to make sure the tools, the parts, and the subassemblies comply with the specification, within the allowable engineering tolerance.

Accordingly, it is desirable to provide a system and method for manufacturing that uses as-built data in computer models and/or drawings.

SUMMARY OF THE INVENTION

The foregoing needs are met, to a great extent, by the present invention, wherein in one aspect a system is provided that in some embodiments measures as-built data of an three dimensional assembly or part using a metrology device, and feeds that information into a computer-aided design change propagation system for use in creating more accurate schematics, and for use in after-market support.

In accordance with one embodiment of the present invention, a system for manufacturing an assembly is disclosed. The system contains a metrology device capable of measuring parametric characteristics of the part, assembly or installation and creating data regarding said location; a computer-readable storage medium storing a first theoretical computer-aided design model for the assembly and/or a theoretical authority three dimensional model for the assembly; and a computer-aided design system connected to the metrology device and the relational database medium with a unified communications link. The computer-aided design system is capable of obtaining said data from the metrology device, and the computer-aided design system is capable of morphing a second as-built design model reflecting the data and the first computer-aided design model, or modifying the theoretical computer-aided design model to reflect the as-built data. The system also, optionally, can contain a statistical analyzer capable of determining and automatically dispositioning the standard cartesian X,Y,Z deviation or the variance of the data for a plurality of like assemblies, and using said standard deviation or said variance is used to create a new theoretical authority model for the assembly. Optionally, the system could be implemented without monolithic tooling fixtures. Optionally, the system can be capable of comparing the modified theoretical computer-aided design model, or the second computer as-built model, with the first computer-aided design model to determine whether the spatial location of the characteristic is within a tolerance. In a preferred embodiment, the storage medium stores the aforementioned information in a relational database.

In accordance with another embodiment of the present invention, a maintenance system for an assembly is disclosed. The system contains a storage medium containing a theoretical computer-aided design model of the assembly, a displaying means for displaying the computer-aided design model, a metrology device capable of measuring the location of at least one characteristic of the assembly and creating modeling data regarding the cartesian location, and a replacing means for replacing a part of the assembly with a fixed tooling. The replacing means is capable of determining the spatial location for said replacement part on the assembly by contextual linking the computer-aided design model and the as-built manufactured data created by the metrology device to information stored on a storage medium, optionally in the form of a unified relational database. Optionally, the computer-aided design model reflects as-built data created using the metrology device or another metrology device capable of measuring the location of at least one characteristic of the assembly and creating data regarding said location. Optionally, the displaying means can be an augmented-reality mask, which can display the actual as-built assembly, the actual part to be replaced in the assembly, and synchronization of where the actual part should be placed within the assembly based on said computer-aided as-built design model. Optionally, the system can be implemented without a tooling fixture for quality assurance purposes.

Methods for using the systems, and computer readable media containing software that implements the computer aspects of the system are also disclosed.

There has thus been outlined, rather broadly, certain embodiments of the invention in order that the detailed description thereof herein may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional embodiments of the invention that will be described below and which will form the subject matter of the claims appended hereto.

In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of embodiments in addition to those described and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein, as well as the abstract, are for the purpose of description and should not be regarded as limiting.

As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a system diagram illustrating a manufacturing system according to a preferred embodiment of the invention.

FIG. 2 is a perspective view of an alternative embodiment of the invention.

FIG. 3 is a part view of an alternative embodiment of the invention.

FIG. 4 is a flow diagram of an embodiment of the invention.

FIG. 5 is a flow diagram of an alternative embodiment of the invention.

FIG. 6 is a flow diagram of an alternative embodiment of the invention.

DETAILED DESCRIPTION

Preferred embodiments of the invention will now be described with reference to the drawing figures, in which like reference numerals refer to like parts throughout. The embodiments of the present invention will be discussed herein in the context of aircraft manufacture. However, it is understood by the reader that the patent is directed toward manufacturing generally, and is not limited to manufacturing of aircraft.

An embodiment in accordance with the present invention provides a manufacturing system for an assembly in which as-built data for the assembly is fed back into the CAD/CAM system for use in creating new CAD models reflecting the as-built data. With the as-built data on hand, new authority models can be created, which more accurately reflect the environmental realities involved in large-scale assembly manufacturing. Once these authority models are institutionalized within a per defined acceptable statistical range, they can be stored and utilized by large scale systems integrators, governmental agencies or customers as the specification for the assembly to be delivered by the manufacturer. Having more accurate authority models allows the manufactured products to conform to the as-built authority models more efficiently, which reduces time for heavy maintenance and repair, airplane on ground and general costs related to non-conformance.

Additionally, in a preferred embodiment, having an accurate as-built model allows the assembly to be built in some instances without tool fixtures, because the authority model will inform persons or machines performing the manufacturing task whether the alteration being made to the assembly is within the acceptable tolerance. Therefore, tooling fixtures need not be in place because the metrology device can compare the change about to be made with an accurate authority model and determine if the change is being made within the acceptable tolerance. In this instance the tooling fixture becomes a simplified holding fixture without the rigorous tool routine maintenance and configuration requirements currently imposed.

Furthermore, in a preferred embodiment, the as-built data can be used for aftermarket support, including maintenance, repair and operation (MR&O), and airplane-on-ground (AOG) scenarios, which occur after a catastrophic event during which large tooling fixtures are not available, i.e., on an airport runway. When the person or machine performing the MR&O or the AOG repair has the 3D CAD model containing the as-built data as measured by a metrology device during or immediately after manufacture, that person can access through the relational database the precise location where replacement parts were installed, for example, because the person knows where the part being replaced was located when the assembly was built. Thus, a significant amount of engineering time can be saved because, for example, a repair engineer trying to replace a missing hinge fitting does not need to fight the difference between the defined theoretical location and the actual as-built location to determine where the fitting hingeline should go. The original spatial location was based on a theoretical model that did not indicate the actual location of the hinge centerline, which may have mislocated based on as-built or other manufacturing influences, fro example the fitting attach hole pattern being drilled in a location, or at an angle, that is not the exact theoretical location or angle, but is within an acceptable tolerance of theoretical drawing tolerances. The repair engineer using this embodiment, instead has an actual 3D model of the as-built data, complete with the imperfect as-built location, and therefore can know more accurately where to place the hinge fitting and attachment hole patterns.

An embodiment of the present inventive system and method is illustrated in FIG. 1, which shows a manufacturing system 10 containing a metrology device 12. The metrology device 12 measures characteristics of an assembly 14 which is being manufactured. The metrology device 12 can be a contact metrology device or a non-contact scanning metrology device. In either case, the metrology device 12 uses laser beams 16 to track the characteristics of the assembly 14 in a three-dimensional Cartesian space. Although the metrology device uses lasers in a preferred embodiment, other types of metrology devices, that may not use lasers or laser beams, can also be used e.g, photogrammetry, rotating lasers.

For example, where a hole 18 exists in the hinge assembly 14, the metrology device 12 scans the assembly 14 using the laser beams 16, and discovers the hinge centerline 18 in the assembly 14. The metrology device measures the x, y, and z coordinates of the hole 18, with respect to a parametric reference point within the as-build three dimensional model (not labeled) on the assembly 14. This information is then parameterized and imported through a contextual link and synchronized over a communications link 20 through a relational database at a product-lifecycle-management (PLM) system 22. Some additional details of the parameterization are contained in U.S. patent application Ser. No. 09/928,583 by Michael C. Richey, filed Aug. 13, 2001, entitled “System and Method for Producing an Assembly by directly Implementing Three-Dimensional Computer-Aided Design Component Definitions,” which is incorporated herein by reference.

The communications link 20 is preferably a TCP/IP network, but can be any medium that is used to communicate data, and includes, but is not limited to, wired Ethernet, 802.11x wireless communications channels (e.g., “wi-fi”), Bluetooth™ wireless communications channels, or satellite communications channels, and can be direct communication, or communication via a distributed network, such as the Internet. In a preferred embodiment, the PLM system 22 is a desktop, notebook, or other computer with PLM software installed. The PLM software can be any software that is capable of performing the functions described herein. In a preferred embodiment, the software is a suite of products from Dassault Systems S.A. of Suresnes Cedex, France. Dassault's software suite includes Version 5 of the CATIA CAD tool, which is capable of altering CAD models based on raw data that is input into the system. The Dassault suite also includes ENOVIA and DELNIA. ENOVIA is a Product Data Management (PDM) system that enables the creation of dynamic, knowledge-based products, processes, and resources. It enables the creation of dynamic, knowledge-based products and processes that drive optimized product definition, manufacturing preparation, production and service.

The PLM software also has the ability to store tolerance information for each component of the assembly being designed or built. For example, if the theoretical model of the assembly 14 states that a fitting location 18 should be at specific coordinates (x, y, z), so that a hinge 34 can be inserted therein. The PLM software is capable of storing data reflecting the opinion of the designer or manufacturer that, if the x coordinate of the feature 18 is within + or −0.010 millimeters of theoretical x, the y coordinate of the feature 18 is within + or −0.005 millimeters of theoretical y, and the z coordinate of feature 18 is within + or −0.015 millimeters of theoretical z, the fitting 18 is said to be within an acceptable “tolerance.” The PLM software can store this relational tolerance information for each characteristic of the assembly 14, of which the hinge fitting and attach hole pattern 18 is an example.

The system 10 also contains a storage medium 24 containing a relational database 26 In a preferred embodiment, the storage medium 24 is a hard disk within a server, but can include other computer-readable storage media, including hard drive, CDs, DVDs and flash media. The storage medium 24 containing the relational database 26 is coupled to the PLM as-build models 22 by a communications link 20. The relational database can be within the PLM system 22, in which case the communications link 20 between the PLM system 22 and the as-built model 24 is an IDE cable or another cable used to connect media drives to computer PLM and metrology systems. Alternatively, the storage medium 24 can be stored in a different location from the PLM system, as its own computer system or within a separate computer system, in which case the communications link 20 between the PLM system 22 and the storage medium 24 is any communications link used to communicate between computer systems, which is preferably a TCP/IP network, but can be any medium that is used to communicate data, and includes, but is not limited to, wired Ethernet, 802.11x wireless communications channels (e.g., “wi-fi”), Bluetooth™ wireless communications channels, or satellite communications channels, and can be direct communication, or communication via a distributed network centric, such as the Internet.

The storage medium 24 contains a relational database 26 containing theoretical model of the assembly 14 or any number of sub-assemblies (not shown) of the assembly 14. The relational database corresponding to this theoretical model 26 can be unified and contextually linked to the CAM software and the as-built data can be federated into the PLM system 22, and can be graphically displayed on a display means 28 at the manufacturing site, or at other places. The display means 28 can be any apparatus capable of displaying video from a computer, and may or may not include the computer generating the display. The data also contains the tolerance information described above, for each characteristic of the assembly. Because the PLM system has access to the theoretical 3D CAD model data for the assembly, the person or machine performing the manufacturing step can determine whether the step he, she, or it is about to perform, i.e. drilling a hole, conforms with the theoretical design, within acceptable tolerance.

Additionally, the relational database 26 also contains a 3D CAD model 30 of the actual assembly 14, reflecting the as-built data collected by the metrology device 12. After a manufacturing step has been performed, i.e. a hole 18 has been drilled, the metrology device 12 measures the new characteristic of the assembly, and converts that information to data. This contextual data is imported along the communications link 20 to the PLM system 22, which merges this data with the as-built 3D CAD model 30, either updating that model or creating a new model, which reflects the as-built data, including the change just made.

After a statistically significant sample of the same or similar assemblies have been manufactured and measured using the system 10, a statistical analyzer 32 can be used to compare the as-built data for each assembly. These models, and the original theoretical model if it existed, can be used to form a new institutionalized as-built authority model. This model will more accurately reflect the manufacturing process, because it will take into account the as-built data, which reflects any miscalculations made during the design phase that were due to the design software's inability to take manufacturing realities into account. More accurate as-built authority models can be used in future negotiations or agreements with customers or governmental regulatory bodies. With as-built data driving the authority model, the manufacturer is less likely to suffer the penalties and costs of non-conformance with the authority model. This in turn will open market application for service after sales and heavy maintenance and repair opportunities.

In the example where a hinge fitting 34 will be inserted into located 18, the as-built data for the location and orientation of fitting 18 will be valuable. The person or machine responsible for locating the fitting will be able to know the as-built location of the fitting 18, and will not be forced to look to an outdated theoretical model, and experiment with orientations of fitting 34 in order to accurately locate the fitting into its orial as-built location. Having the precise Cartesian coordinates of hole 18, in visible form viewable in the display means 28, the person or machine will be able to match the fitting location exactly, on the first attempt. Utilizing the as-built data to locate part to part indexing—determining where one part goes in relation to another part, decreases engineering time spent on the manufacturing process.

For each particular assembly, the as-built model created during the manufacturing process can be used for a number of after-market support functions, including scheduled Maintenance Repair and Operation (MR&O) and unscheduled Airplane on Ground (AOG) maintenance. Referring now to FIG. 2, a system for maintenance 36 is shown. A metrology device 12 is shown, and is coupled to a PLM system 22 and a display means 28. The metrology device and the PLM system are similar to those shown in FIG. 1. Additionally, a storage medium 24 is shown, containing the as-built 3D model of the particular assembly 30. If a part 38 has come apart from the assembly or has been damaged and needs replacement 14, the as-built 3D model will disclose, to the person or machine responsible for performing the maintenance, the precise location of the original part that the maintenance engineer or machine will be replacing. Thus, the maintenance engineer will have a visual aid in replacing part 38, and will not have to rely on the theoretical 3D drawings, which may not reflect the location of the part with enough specificity. Thus, maintenance and repair take significantly less time because of the reduction in touch labor. Additionally, maintenance can be performed in the field without a fixed tooling assembly because the model is the authority for repair, and the tooling assembly is no longer necessary. This can be accomplished by orientation the metrology device to pre-defined engineering index features within the structure, clocking the as-built three dimensions model and using the synchronized real-time data to perform maintenance activities. Additionally, this information could be federated from the relational database and embedded into the process engineering and maintenance simulation task.

In a alternate embodiment of the system, the display means is an augmented reality device. An example of such a device is a Xybernaut wearable computer, from Xybernaut of Fairfax, Va. An exemplary augmented reality device is shown in FIG. 3. Looking through this augmented reality device, a manufacturing or maintenance engineer can look at the as-built 3D model, the actual assembly, and the replacement part, all at the same time. Using the 3D model, a maintenance engineer can replace a part by positioning the part near its intended location, until he receives a “lock on” notification in his augmented reality screen, to indicate that the replacement part is positioned exactly where the original part was during manufacturing. This makes single-person maintenance possible without the use of tooling fixtures, because the maintenance engineer has the authority for the maintenance in his field of view, and does not need a fixture to make sure that a replacement part is replaced in an appropriate place and orientation.

Referring now to FIG. 4, a flow diagram for a manufacturing process is shown. When an assembly is presented to a metrology device, the metrology device communicates the identity of the assembly to the PLM system 40. If the PLM system indicates that a CAD/CAM model containing as-built data does not exist for this assembly 42, the metrology device scans the assembly and creates a CAD/CAM model based on the locations of the various components and characteristics of the assembly 44. Once the CAD/CAM model exists (whether it was pre-existing, or it was just created using the metrology device), the assembly is now ready to have actions taken upon it that will change its structure, appearance, or other characteristics. When such an action is taken 46, the metrology device sends the change information to the PLM system 48. The PLM system then modifies the CAD/CAM model to reflect the change to the assembly 50. If there is another change made 52, the process is executed again. When all changes have been made, the CAD model reflects the final as-built data of the assembly. It can now be used in aftermarket support.

Referring now to FIG. 5, a flow diagram for a maintenance process is shown. The as-built 3D CAD model is brought into the viewing means 54. From the as-built 3D CAD relational database, the special location of the replacement part is determined based on the location in the model of the part being replaced 56. The location of the original part is found on the assembly 58, and the replacement part is placed in that location by a person or a machine that can see or has access to the as-built CAD model, the actual assembly, and the replacement part 60.

Referring now to FIG. 6, a more detailed flow diagram is shown. The process begins with a theoretical model, of parts, assemblies, installations, including functional text and annotation 62. A 3D Graphical Metrology software Interface, including a Spatial Analyzer Scanner-Tracker is linked to unified relational design parameters through knowledgeware 64. By interfacing this spatial analyzer with the software interface the as-built data can be measured 66. The as-built data then is output over a contextual-relational link to parametric solids features management through imported data through Knowledgeware Rules and a relational database 68. Next, an as-Built parametric geometry interface institutionalizes as-built data to as-designed data 70. The as-built institutionalized morphed model is stored in a relational database 26. The finished institutionalized morphed model can be extended to many enterprise applications.

The many features and advantages of the invention are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the invention which fall within the true spirit and scope of the invention. Further, since numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention. 

1. A system for manufacturing an assembly, comprising: (a) a metrology device capable of measuring the location of at least one characteristic of the assembly and creating coordinate data regarding said location; (b) a computer-readable storage medium storing a theoretical computer-aided design model for one of a part, assembly and installation authority model; and (c) a computer-aided design system coupled to said metrology device and said computer-readable storage medium using a communications link; wherein said computer-aided design system is capable of obtaining said data from said metrology device, and wherein said computer-aided design system is capable of creating an as-built computer-aided design model linking or importing conceptual data with said first theoretical computer-aided design model.
 2. The system of claim 1, further comprising a statistical analyzer capable of determining at least one of the standard deviation and the linked conceptual variance of said data for a plurality of like assemblies based on pre-determined inputs.
 3. The system of claim 0, wherein said standard deviation or said linked conceptual variance is used to create a new as-built authority model for the part, assembly or installation.
 4. The system of claim 1, wherein said system does not contain a tooling fixture for quality assurance purposes.
 5. The system of claim 4, further comprising a less complex holding fixture utilizing said as-build model to define authority for manufacturing.
 6. The system of claim 1, wherein said computer-aided design system is capable of comparing said second computer-aided design model with said first computer-aided design model to determine whether the location of said characteristic is within a tolerance.
 7. The system of claim 1, wherein said computer readable medium stores said theoretical computer aided design model in a relational database.
 8. A system for manufacturing an assembly, comprising: (a) a metrology device capable of measuring the location of at least one characteristic of the assembly and creating parametric data regarding said location; (b) a computer-readable storage medium storing a first computer-aided design model for one of the assembly and a theoretical authority model for the assembly; and (c) a computer-aided design system coupled to said metrology device and said computer-readable storage medium using a unified contextual import interface; wherein said computer-aided design system is capable of obtaining said data from said metrology device, and wherein said computer-aided design system is capable of morphing said first computer-aided design model to reflect said data.
 9. The system of claim 8, further comprising a statistical analyzer capable of determining at least one of the standard deviation and the variance of said data for a plurality of like assemblies.
 10. The system of claim 9, wherein said standard deviation or said variance is used to create a new authority model for the assembly.
 11. The system of claim 8, wherein said system does not contain a large scale tooling fixture for quality assurance purposes.
 12. The system of claim 8, wherein said computer-aided design system is capable of comparing said modified first computer-aided design model parameters with said first computer-aided design model to determine whether the location of said characteristic is within a tolerance.
 13. The system of claim 8, wherein said computer-readable storage medium stores said first computer-aided design model in a relational database.
 14. A maintenance system for an assembly, said system comprising: (a) a storage medium containing a computer-aided as-built model of the assembly; (b) a displaying means for displaying said computer-aided design model; (c) a metrology device capable of measuring the location of at least one characteristic of the assembly and creating real-time data regarding said location; (d) a replacing means for replacing a part of the assembly with a replacement part, wherein said replacing means is capable of determining in real time the destination for said replacement part on the assembly by analyzing said computer-aided design model and said data created by said metrology device.
 15. The system of claim 14, where-in said computer-aided design model reflects as-built data created using said metrology device or a second metrology device capable of measuring the location of at least one characteristic of the assembly and creating data spacial orientation regarding said location.
 16. The system of claim 14, wherein said displaying means is an augmented-reality unified with phyicial part, assembly or installation.
 17. The system of claim 16, wherein said augmented-reality mask displays the actual assembly, the actual part to be replaced in the assembly, and an special relationship of where the actual part should be placed within the assembly based on said integrated metrology and computer-aided as-built model.
 18. The system of claim 14, wherein said system does not contain a tooling fixture for quality assurance purposes.
 19. A method of manufacturing an assembly, said method comprising the steps of: (a) measuring the location of at least one parametric feature of the assembly and creating data regarding said location; (b) storing a first computer-aided design model for one of the assembly and a theoretical authority model for the assembly; and (c) obtaining said data from said metrology device, and morphing said first computer-aided design model to reflect said data.
 20. The method of claim 19, further comprising the step of determining at least one of the standard deviation and the variance of said data for a plurality of like assemblies.
 21. The method of claim 20, further comprising the step of using said standard deviation or said variance to create a new authority model for the assembly.
 22. The method of claim 19, wherein said method is performed without using a tooling fixture for quality assurance purposes.
 23. The method of claim 19, further comprising the step of comparing said modified first computer-aided design model with said first computer-aided design model to determine whether the location of said characteristic is within a tolerance.
 24. A method of manufacturing an assembly, said method comprising the steps of: (a) measuring the location of at least one characteristic of the assembly and creating data regarding said location; (b) storing a first computer-aided design model for one of the assembly and a theoretical authority model for the assembly; and (c) obtaining said data from said metrology device, and creating a second computer-aided design model reflecting said data and said first computer-aided design model.
 25. The method of claim 24, further comprising the step of determining at least one of the standard deviation and the variance of said data for a plurality of like assemblies.
 26. The method of claim 25, further comprising the step of using said standard deviation or said variance to create a new theoretical authority model for the assembly.
 27. The method of claim 24, wherein said method is performed without using a tooling fixture for quality assurance purposes.
 28. The method of claim 24, further comprising the step of comparing said second computer-aided design model with said first computer-aided design model to determine whether the location of said characteristic is within a tolerance.
 29. A method of maintenance for an assembly, said method comprising the steps of: (a) storing a as-built computer-aided design model of the assembly; (b) displaying said computer-aided design model; (c) measuring the location of at least one characteristic of the assembly using a metrology device and creating data regarding said location; and (d) replacing a part of the assembly with a replacement part by determining the destination for said replacement part on the assembly by analyzing said computer-aided design model and said data created by said metrology device.
 30. The method of claim 29, wherein said computer-aided design model reflects as-built data created using said metrology device or a second metrology device capable of measuring the location of at least one characteristic of the assembly and creating data regarding said location.
 31. The method of claim 29, wherein said displaying step is performed using an augmented-reality mask.
 32. The method of claim 31, wherein said augmented-reality mask displays the actual assembly, the actual part to be replaced in the assembly, and an indication of where the actual part should be placed within the assembly based on said computer-aided design model.
 33. The method of claim 29, wherein said method is performed without a tooling fixture for quality assurance purposes.
 34. A computer-readable medium comprising code executable by a computer for performing the steps of: (a) storing a first computer-aided design model for one of an assembly and a theoretical authority model for said assembly; and (b) obtaining parametric data from said metrology device reflecting the location of at least one characteristic of said assembly, and morphing said first computer-aided design model to reflect said data.
 35. The computer-readable medium of claim 34, further comprising code executable by a computer for performing the step of determining at least one of the standard deviation and the variance of said data for a plurality of like assemblies.
 36. The computer-readable medium of claim 35, further comprising code executable by a computer for performing the step of using said standard deviation or said variance to create a new theoretical authority model for the assembly.
 37. The computer-readable medium of claim 34, further comprising code executable by a computer for performing the step of comparing said modified first computer-aided design model with said first computer-aided design model to determine whether the location of said characteristic is within a tolerance.
 38. A computer-readable medium comprising code executable by a computer for performing the steps of: (a) storing a first computer-aided design model for one of an assembly and a theoretical authority model for said assembly; and (b) obtaining parametric data from said metrology device reflecting the location of at least one characteristic of said assembly, and morphing a second computer-aided design model to reflect said data and said first computer-aided design model.
 39. The computer-readable medium of claim 38, further comprising code executable by a computer for performing the step of determining at least one of the standard deviation and the variance of said data for a plurality of like assemblies.
 40. The computer-readable medium of claim 39, further comprising code executable by a computer for performing the step of using said standard deviation or said variance to create a new theoretical authority model for the assembly.
 41. The computer-readable medium of claim 38, further comprising code executable by a computer for performing the step of comparing said second computer-aided design model with said first computer-aided design model to determine whether the location of said characteristic is within a tolerance.
 42. A computer-readable medium comprising code executable by a computer for performing the steps of: (a) storing a computer-aided design model of an assembly; (b) displaying said computer-aided design model; and (c) determining the special orientation for a replacement part for said assembly on said assembly by analyzing said computer-aided design model and data created by a metrology device.
 43. The computer readable medium of claim 42, wherein said computer-aided design model reflects as-built data created using said metrology device or a second metrology device capable of measuring the location of at least one characteristic of the assembly and creating data regarding said location.
 44. The computer readable medium of claim 42, wherein said code for performing said step of displaying performs said step using an augmented-reality mask.
 45. The computer readable medium of claim 44, wherein said augmented-reality mask displays the special orientation of the actual assembly, the phycial part to be replaced in the assembly, and an indication of where the actual part should be placed based on said computer-aided as-built model. 